The milestone highlights the accelerating rate of discoveries, just over three decades since the first exoplanets were found. The official number of exoplanets — planets outside our solar system — ...

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.

Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that ...

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how ...

Astronomers have spotted an unusual 'inside-out' planetary system where a rocky world seems to have formed far beyond the realm typically reserved for gas giants.

Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific expectations – and suggests these faraway worlds formed in a manner never seen ...

A University of Arizona-led team discovered a growing planet, WISPIT 2b, forming inside a disk gap around a young star. The finding confirms theories that protoplanets carve out gaps in disks of gas ...